It was a combination of recorded audio and hands on. I had a sound in my head and I couldn't quite achieve it, it was similar to Petrucci's liquid lead tone. I also wanted more gain in my rhythm tones. I found out that Petrucci has used Mark series amps and eventually a Mark III blue stripe showed up on the local market in March of this year.
I tried it a couple times in the store. While I had no idea how to dial it in, I was able to confirm there was plenty of gain (more available that I typically use), good cleans, and that with the GEQ I'd have far more control over my tone than I have ever had before. Last step was posting here and confirming the price was fair, getting some settings, and some advice here. I went back tried some of the settings and was able to confirm the Mark III was capable of getting me where I wanted to go.